# Metric Formats

Various metric formats are employed in monitoring systems to measure performance, consumption, and other software properties. These formats serve as standardized ways to represent and transmit metric data. Here are some notable metric formats used in monitoring systems:

### Prometheus format

Prometheus, a widely used monitoring system, defines its format for metrics, including types like Counter, Gauge, Histogram, and Summary.

### JSON format

JSON is a lightweight, easy-to-read data-interchange format.

{% hint style="warning" %}
**Warning:** JSON data should be compressed using the Snappy protocol. Snappy provides fast compression and decompression, making storing and transmitting JSON data more efficient.
{% endhint %}

## Metric source classification

From a technical standpoint, there is no distinct categorization of metric sources. Any device, software, or application capable of generating and presenting metrics compatible with Prometheus is considered part of this group. Nonetheless, in most instances, the Prometheus agent emerges as the optimal solution. Here, we can name some common agents that are capable of producing Prometheus-compatible metrics:

* Prometheus
* Grafana Agent
* OpenTelemetry
* FluentBit

## Metrics examples

{% tabs %}
{% tab title="JSON" %}

```json
{
  "input": {
    "cpu.0": {
      "records": 8,
      "bytes": 2536
    }
  },
  "output": {
    "stdout.0": {
      "proc_records": 5,
      "proc_bytes": 1585,
      "errors": 0,
      "retries": 0,
      "retries_failed": 0
    }
  }
}
```

{% endtab %}

{% tab title="Prometheus" %}

```prometheus
fluentbit_input_records_total{name="cpu.0"} 57 1509150350542
fluentbit_input_bytes_total{name="cpu.0"} 18069 1509150350542
fluentbit_output_proc_records_total{name="stdout.0"} 54 1509150350542
fluentbit_output_proc_bytes_total{name="stdout.0"} 17118 1509150350542
fluentbit_output_errors_total{name="stdout.0"} 0 1509150350542
fluentbit_output_retries_total{name="stdout.0"} 0 1509150350542
fluentbit_output_retries_failed_total{name="stdout.0"} 0 1509150350542
```

{% endtab %}
{% endtabs %}


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